{"product_id":"mad-fatboy-primary-downpipes-bmw-f90-m5-f91-f92-f93-m8","title":"MAD FATBOY Primary Downpipes | BMW F90 M5 | F91\/F92\/F93 M8","description":"\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003ch3\u003eMAD FATBOY Primary Downpipes\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBMW F90 M5 | BMW F91\/F92\/F93 M8\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMaximize exhaust flow and unlock a more aggressive sound with the MAD FATBOY Primary Downpipes. Designed with the largest practical piping diameter between the mounting flanges, these downpipes provide a high-flow upgrade for performance-focused S63-powered BMW builds.\u003c\/p\u003e\n\u003cp\u003eConstructed from premium T304 stainless steel, each downpipe features smooth mandrel bends and non-restrictive transitions designed to reduce turbulence and backpressure. This supports quicker turbo response, improved throttle response, and increased horsepower and torque potential when paired with proper tuning.\u003c\/p\u003e\n\u003cp\u003eIntegrated flex sections allow for controlled movement within the exhaust system, while the direct bolt-on design connects to the factory exhaust without cutting or welding.\u003c\/p\u003e\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePremium T304 stainless-steel construction\u003c\/li\u003e\n\u003cli\u003eOversized FATBOY high-flow design\u003c\/li\u003e\n\u003cli\u003eLargest practical piping diameter between flanges\u003c\/li\u003e\n\u003cli\u003eSmooth mandrel-bent tubing\u003c\/li\u003e\n\u003cli\u003eNon-restrictive exhaust transitions\u003c\/li\u003e\n\u003cli\u003eIntegrated flex sections\u003c\/li\u003e\n\u003cli\u003eHelps reduce exhaust backpressure\u003c\/li\u003e\n\u003cli\u003eSupports quicker turbo spool\u003c\/li\u003e\n\u003cli\u003eImproved throttle-response potential\u003c\/li\u003e\n\u003cli\u003eMore aggressive exhaust note\u003c\/li\u003e\n\u003cli\u003eCompatible with right-hand-drive and left-hand-drive vehicles\u003c\/li\u003e\n\u003cli\u003eDirect bolt-on installation\u003c\/li\u003e\n\u003cli\u003eNo cutting or welding required\u003c\/li\u003e\n\u003cli\u003eInstallation hardware and gaskets included\u003c\/li\u003e\n\u003cli\u003eLifetime warranty against manufacturing defects and fitment issues\u003c\/li\u003e\n\u003cli\u003e90-day return period\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePerformance Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePotential gains of up to 30 horsepower on factory turbochargers\u003c\/li\u003e\n\u003cli\u003eAdditional power potential with upgraded turbochargers\u003c\/li\u003e\n\u003cli\u003eIncreased exhaust-flow capacity\u003c\/li\u003e\n\u003cli\u003eFaster turbo response\u003c\/li\u003e\n\u003cli\u003eImproved horsepower and torque potential\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eActual results depend on tuning, fuel quality, supporting modifications, vehicle condition, and testing method.\u003c\/p\u003e\n\u003ch3\u003eVehicle Fitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBMW M5 (F90)\u003c\/li\u003e\n\u003cli\u003eBMW M8 Convertible (F91)\u003c\/li\u003e\n\u003cli\u003eBMW M8 Coupe (F92)\u003c\/li\u003e\n\u003cli\u003eBMW M8 Gran Coupe (F93)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eEngine:\u003c\/strong\u003e S63 Twin-Turbo V8\u003c\/p\u003e\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThese primary downpipes may trigger a check-engine light.\u003c\/li\u003e\n\u003cli\u003eECU tuning may be required.\u003c\/li\u003e\n\u003cli\u003eRemoval of factory catalytic converters may violate emissions and road-use laws.\u003c\/li\u003e\n\u003cli\u003eIntended for off-road or competition use where legally permitted.\u003c\/li\u003e\n\u003cli\u003eConfirm exact vehicle and exhaust compatibility before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAvailability\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIn Stock \u0026amp; Ready to Ship\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOrders generally ship within \u003cstrong\u003e1–2 business days\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eProfessional installation and appropriate ECU tuning are strongly recommended. Uproar Customs does not provide installation instructions or technical support for self-installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Uproar Customs","offers":[{"title":"Default Title","offer_id":47288254955689,"sku":null,"price":459.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0701\/1575\/4153\/files\/mad-performance-mad-bmw-f90-m5-f92-m8-fatboy-primary-downpipes-s63r-45407577768219.webp?v=1784924007","url":"https:\/\/www.uproarcustoms.com\/products\/mad-fatboy-primary-downpipes-bmw-f90-m5-f91-f92-f93-m8","provider":"Uproar Customs","version":"1.0","type":"link"}